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Thursday, February 16, 2006

The J/CB/1933 design

This design has ballooned to 90,800 tons, normal displacement. The reason is that the ship is well-armed, moderately well-protected, and has a high speed (well, relatively high speed) of 33 knots. This is the Springsharp report:
J/CB/1933, Japan Battlecruiser laid down 1933

Displacement:
 81,822 t light; 85,270 t standard; 90,800 t normal; 95,224 t full load

Dimensions: Length overall / water x beam x draught
 980.78 ft / 975.00 ft x 124.00 ft x 35.00 ft (normal load)
 298.94 m / 297.18 m x 37.80 m  x 10.67 m

Armament:
      10 - 18.00" / 457 mm guns (4 mounts), 2,916.00lbs / 1,322.68kg shells, 1933 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      12 - 6.00" / 152 mm guns (4x3 guns), 108.00lbs / 48.99kg shells, 1933 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships
      20 - 5.00" / 127 mm guns (10x2 guns), 62.50lbs / 28.35kg shells, 1933 Model
   Dual purpose guns in deck mounts with hoists
   on side, evenly spread, 6 raised mounts
      56 - 2.24" / 57.0 mm guns (28x2 guns), 5.65lbs / 2.56kg shells, 1933 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread, 18 raised mounts
 Weight of broadside 32,022 lbs / 14,525 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 15.0" / 381 mm 640.00 ft / 195.07 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 12.0" / 305 mm 640.00 ft / 195.07 m 8.00 ft / 2.44 m
   Main Belt covers 101 % of normal length

   - Torpedo Bulkhead:
  7.00" / 178 mm 640.00 ft / 195.07 m 34.00 ft / 10.36 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 15.0" / 381 mm 13.0" / 330 mm  15.0" / 381 mm
 2nd: 6.00" / 152 mm 6.00" / 152 mm  6.00" / 152 mm

   - Armour deck: 8.00" / 203 mm, Conning tower: 15.00" / 381 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 6 shafts, 353,975 shp / 264,065 Kw = 33.01 kts
 Range 11,000nm at 15.00 kts
 Bunker at max displacement = 9,955 tons

Complement:
 2,614 - 3,399

Cost:
 £36.259 million / $145.034 million

Distribution of weights at normal displacement:
 Armament: 4,003 tons, 4.4 %
 Armour: 35,433 tons, 39.0 %
    - Belts: 6,354 tons, 7.0 %
    - Torpedo bulkhead: 5,636 tons, 6.2 %
    - Armament: 7,792 tons, 8.6 %
    - Armour Deck: 14,999 tons, 16.5 %
    - Conning Tower: 653 tons, 0.7 %
 Machinery: 10,314 tons, 11.4 %
 Hull, fittings & equipment: 32,072 tons, 35.3 %
 Fuel, ammunition & stores: 8,978 tons, 9.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   132,264 lbs / 59,994 Kg = 45.4 x 18.0 " / 457 mm shells or 24.3 torpedoes
 Stability (Unstable if below 1.00): 1.13
 Metacentric height 8.7 ft / 2.7 m
 Roll period: 17.6 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.68
 Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.751
 Length to Beam Ratio: 7.86 : 1
 'Natural speed' for length: 31.22 kts
 Power going to wave formation at top speed: 55 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 6.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  36.00 ft / 10.97 m
    - Forecastle (20 %): 29.00 ft / 8.84 m
    - Mid (67 %):  29.00 ft / 8.84 m
    - Quarterdeck (15 %): 29.00 ft / 8.84 m
    - Stern:  29.00 ft / 8.84 m
    - Average freeboard: 29.56 ft / 9.01 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 83.8 %
  - Above water (accommodation/working, high = better): 214.2 %
 Waterplane Area: 101,347 Square feet or 9,415 Square metres
 Displacement factor (Displacement / loading): 103 %
 Structure weight / hull surface area: 233 lbs/sq ft or 1,140 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 1.00
  - Longitudinal: 1.04
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

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